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Maturation transition of T = 7 HK97. A) The immature Prohead II (pdbid:3e8k) B) The mature Head II (pdbid:10hg). C) The first non degenerate normal mode for Prohead II, is a breathing/expansion model. D) The second non-degenerate normal mode is concentrated at the pentamers and contributes to the faceted morphology of Head II. Pentamers are blue in C and D)
